Poor performance in Unity - SOLVED

Ok, it was the nVidia drivers. I rolled back and it was fine.

Actually this was not fix. I did find a fix - closing Home - but this no longer works as before.

To go back to the problem: Performance in unity (on a 1080ti no less) tanks to 20-30fps on any scene. But NOT after I shut down Home. Closing it while Playing in Unity reverted performance to normal.

To clarify - I had to start the scene, see the framerate tank, then close Home and it worked.

However this no longer works. As soon as I close Home it pops back immediately when the headset is on. This causes the framerate issues to persist. 

I have updated to all the latest drivers. This also happens both in 5.6.4 and 2017 (latest patch version) - so it's not Unity. 

The workaround was not ideal, but it worked. It no longer does. It seems odd that Home causes this problem with Unity and is immensely frustrating to deal with as I have to develop with Unity every day.

Are you getting that low frame rate playing in Unity's Editor? Or with a
compiled game (started after rebooting your computer, to be sure
nothing else is slowing it down).

I notice my own frame rates within Unity's editor are much worse than a compiled version.

Although,
I'm still getting much higher frames per second than you. Even in the
editor, on a lowly GTX 970, most scenes report 45fps. That's after
adding color correction, and SSAO to the scene too. Without any sort of
optimization.

I'm using Unity 2017.3.0f3. With Oculus Home and Steam VR always running.

One of the test
scenes was the demo from Ghost Town:
https://www.assetstore.unity3d.com/en/#!/content/20736 . Which maintains
45fps in most directions, except one small section drops to 9fps when
you look at it.

@CaptainAwesome -  It is a problem related purely to Unity editor, but not the one you are describing.

Performance in Unity's editor is indeed as you describe in general, but the problem I am describing happens in addition to that. It tanks to low 20s regardless of the content of the scene during 'Play' mode.

But the problem goes away when Home is closed while in Play mode. The performance immediately picks up and improves to the levels you would expect.

One thing to try for better in-editor performance is to make sure you've got 'Maximize on Play' checked for the Game window.  The graphics card is having to render your app to the Rift, but also Unity and all of its UI to the main monitor.  This often causes poor performance.

I'm pursuing other options based on Unity itself. Maybe it's related to that and my part-solution was somehow side-stepping it. No idea, but will try more things.

No luck. I can no longer cause the problem to disappear. I believe when I first reset my PC this morning it started at the appropriate FPS - around 70 or so in the scene I am in. However it is now sitting at 20, but often as low as 6fps. 

Looking at the profiler there seems to be something related to the CPU, with the delay at 60ms at times. This is related to editor overhead or Particles sometimes.

To go back over the issue, I was previously able to close Home and then it would get better for some reason - revert to the correct performance, but I am no longer able to pull that trick. It stays at poor frame rate.

Meanwhile the same scene as a build will perform at the 'correct' frame rate.

The same identical project also performs better for other team members who run on slower hardware.

SOLVED!!

It was nVidia causing Unity editor to perform poorly, not Oculus at fault. I went into task manager and shut down ALL the things nVidia related there and now it runs as it should. It must have been one of those random things that 'solved' it when I shut down Home before - shutting down Home must have got around whatever nVidia was doing at the time. In any case this is sorted and not Oculus' fault.